| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| #ifndef _RESOLV_CACHE_H_ |
| #define _RESOLV_CACHE_H_ |
| |
| #include <sys/cdefs.h> |
| |
| struct __res_state; |
| struct resolv_cache; /* forward */ |
| |
| /* gets the cache for an interface. Set ifname argument to NULL or |
| * empty buffer ('\0') to get cache for default interface. |
| * returned cache might be NULL*/ |
| __LIBC_HIDDEN__ |
| extern struct resolv_cache* __get_res_cache(const char* ifname); |
| |
| /* this gets called everytime we detect some changes in the DNS configuration |
| * and will flush the cache */ |
| __LIBC_HIDDEN__ |
| extern void _resolv_cache_reset( unsigned generation ); |
| |
| /* Gets the address of the n:th name server for the default interface |
| * Return length of address on success else 0. |
| * Note: The first name server is at n = 1 */ |
| __LIBC_HIDDEN__ |
| extern int _resolv_cache_get_nameserver(int n, char* addr, int addrLen); |
| |
| /* Gets the address of the n:th name server for a certain interface |
| * Return length of address on success else 0. |
| * Note: The first name server is at n = 1 */ |
| __LIBC_HIDDEN__ |
| extern int _resolv_cache_get_nameserver_for_iface(const char* ifname, int n, |
| char* addr, int addrLen); |
| |
| /* Gets addrinfo of the n:th name server associated with an interface. |
| * NULL is returned if no address if found. |
| * Note: The first name server is at n = 1. */ |
| __LIBC_HIDDEN__ |
| extern struct addrinfo* _resolv_cache_get_nameserver_addr_for_iface(const char* ifname, int n); |
| |
| /* Gets addrinfo of the n:th name server associated with the default interface |
| * NULL is returned if no address if found. |
| * Note: The first name server is at n = 1. */ |
| __LIBC_HIDDEN__ |
| extern struct addrinfo* _resolv_cache_get_nameserver_addr(int n); |
| |
| /* gets the address associated with the default interface */ |
| __LIBC_HIDDEN__ |
| extern struct in_addr* _resolv_get_addr_of_default_iface(); |
| |
| /* gets the address associated with the specified interface */ |
| __LIBC_HIDDEN__ |
| extern struct in_addr* _resolv_get_addr_of_iface(const char* ifname); |
| |
| /* Copy the name of the default interface to provided buffer. |
| * Return length of buffer on success on failure -1 is returned */ |
| __LIBC_HIDDEN__ |
| extern int _resolv_get_default_iface(char* buff, int buffLen); |
| |
| /* sets the name server addresses to the provided res_state structure. The |
| * name servers are retrieved from the cache which is associated |
| * with the interface to which the res_state structure is associated */ |
| __LIBC_HIDDEN__ |
| extern int _resolv_populate_res_for_iface(struct __res_state* statp); |
| |
| typedef enum { |
| RESOLV_CACHE_UNSUPPORTED, /* the cache can't handle that kind of queries */ |
| /* or the answer buffer is too small */ |
| RESOLV_CACHE_NOTFOUND, /* the cache doesn't know about this query */ |
| RESOLV_CACHE_FOUND /* the cache found the answer */ |
| } ResolvCacheStatus; |
| |
| __LIBC_HIDDEN__ |
| extern ResolvCacheStatus |
| _resolv_cache_lookup( struct resolv_cache* cache, |
| const void* query, |
| int querylen, |
| void* answer, |
| int answersize, |
| int *answerlen ); |
| |
| /* add a (query,answer) to the cache, only call if _resolv_cache_lookup |
| * did return RESOLV_CACHE_NOTFOUND |
| */ |
| __LIBC_HIDDEN__ |
| extern void |
| _resolv_cache_add( struct resolv_cache* cache, |
| const void* query, |
| int querylen, |
| const void* answer, |
| int answerlen ); |
| |
| /* Notify the cache a request failed */ |
| __LIBC_HIDDEN__ |
| extern void |
| _resolv_cache_query_failed( struct resolv_cache* cache, |
| const void* query, |
| int querylen); |
| |
| #endif /* _RESOLV_CACHE_H_ */ |